The '''American Ornithological Society''' ('''AOS''') is an ornithology|ornithological
organization based in the United States. The society was formed in October 2016 by the merger of the American Ornithologists' Union (AOU) and the Cooper Ornithological Society
Its members are primarily professional ornithologists although membership is open to anyone with an interest in birds. The AOS is a member of the Ornithological Council
and Ornithological Societies of North America (OSNA).
The society publishes the two scholarly journals ''The Auk
'' and ''The Condor (journal)|The Condor
'' as well as the ''AOS Checklist of North American Birds
In 2013, the American Ornithologists' Union announced a close partnership with the Cooper Ornithological Society, including joint meetings, a centralized publishing office, and a refocusing of their respective journals to increase efficiency of research.